The Sima 100mm f2 Soft Focus lens is a simple push-pull focusing lens with a widely adaptable T mount (adapters are sold separately). I know it says "soft focus" right on the lens, but if you shoot this at f2, you will get more than you bargained for, I promise you. At f2, calling it "soft focus" is like calling outer space "lightly oxygenated." This is the kind of lens Medusa would use to shoot a dating pfp that doesn't turn her matches to stone. It's the kind of lens you'd use if you wanted to take pictures of some Weeping Angels playing soccer. It's soft, folks.
Stopped down, there's something kind of appealing about it, though. Remember that you'll need a T mount adapter to make this fit your camera.